Meant to say, to answer original post's title, IF the memory card appears as an extra drive in Windows Explorer, when plugged in via the camera, then
HDTach would be able to measure the read/write speeds. If you do get a memory card reader, you could then repeat the HDTach tests, and see if either read/write average throughputs/max. burst rate, and access times improve. If you do carry out write tests, make sure you have emtpied the card of any photos first :>